/// <summary>
/// Initializes a new instance of the <see cref="Microsoft.Win32.SafeHandles.SafeFileHandle" /> class with the specified path, creation mode, read/write and sharing permission, the access other SafeFileHandles can have to the same file, additional file options and the allocation size.
/// </summary>
/// <param name="path">A relative or absolute path for the file that the current <see cref="Microsoft.Win32.SafeHandles.SafeFileHandle" /> instance will encapsulate.</param>
/// <param name="mode">One of the enumeration values that determines how to open or create the file. The default value is <see cref="FileMode.Open" /></param>
/// <param name="access">A bitwise combination of the enumeration values that determines how the file can be accessed. The default value is <see cref="FileAccess.Read" /></param>
/// <param name="share">A bitwise combination of the enumeration values that determines how the file will be shared by processes. The default value is <see cref="FileShare.Read" />.</param>
/// <param name="preallocationSize">The initial allocation size in bytes for the file. A positive value is effective only when a regular file is being created, overwritten, or replaced.
/// Negative values are not allowed. In other cases (including the default 0 value), it's ignored.</param>
/// <param name="options">An object that describes optional <see cref="Microsoft.Win32.SafeHandles.SafeFileHandle" /> parameters to use.</param>
/// <exception cref="T:System.ArgumentNullException"><paramref name="path" /> is <see langword="null" />.</exception>
/// <exception cref="T:System.ArgumentException"><paramref name="path" /> is an empty string (""), contains only white space, or contains one or more invalid characters.
/// -or-
/// <paramref name="path" /> refers to a non-file device, such as <c>CON:</c>, <c>COM1:</c>, <c>LPT1:</c>, etc. in an NTFS environment.</exception>
/// <exception cref="T:System.NotSupportedException"><paramref name="path" /> refers to a non-file device, such as <c>CON:</c>, <c>COM1:</c>, <c>LPT1:</c>, etc. in a non-NTFS environment.</exception>
/// <exception cref="T:System.ArgumentOutOfRangeException"><paramref name="preallocationSize" /> is negative.
/// -or-
/// <paramref name="mode" />, <paramref name="access" />, or <paramref name="share" /> contain an invalid value.</exception>
/// <exception cref="T:System.IO.FileNotFoundException">The file cannot be found, such as when <paramref name="mode" /> is <see cref="FileMode.Truncate" /> or <see cref="FileMode.Open" />, and the file specified by <paramref name="path" /> does not exist. The file must already exist in these modes.</exception>
/// <exception cref="T:System.IO.IOException">An I/O error, such as specifying <see cref="FileMode.CreateNew" /> when the file specified by <paramref name="path" /> already exists, occurred.
/// -or-
/// The disk was full (when <paramref name="preallocationSize" /> was provided and <paramref name="path" /> was pointing to a regular file).
/// -or-
/// The file was too large (when <paramref name="preallocationSize" /> was provided and <paramref name="path" /> was pointing to a regular file).</exception>
/// <exception cref="T:System.Security.SecurityException">The caller does not have the required permission.</exception>
/// <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
/// <exception cref="T:System.UnauthorizedAccessException">The <paramref name="access" /> requested is not permitted by the operating system for the specified <paramref name="path" />, such as when <paramref name="access" /> is <see cref="FileAccess.Write" /> or <see cref="FileAccess.ReadWrite" /> and the file or directory is set for read-only access.
/// -or-
/// <see cref="F:System.IO.FileOptions.Encrypted" /> is specified for <paramref name="options" />, but file encryption is not supported on the current platform.</exception>
/// <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
public static SafeFileHandle OpenHandle(string path, FileMode mode = FileMode.Open, FileAccess access = FileAccess.Read,
FileShare share = FileShare.Read, FileOptions options = FileOptions.None, long preallocationSize = 0)
{
FileStreamHelpers.ValidateArguments(path, mode, access, share, bufferSize: 0, options, preallocationSize);
return(SafeFileHandle.Open(Path.GetFullPath(path), mode, access, share, options, preallocationSize));
}
private FileStream(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options, long preallocationSize)
{
FileStreamHelpers.ValidateArguments(path, mode, access, share, bufferSize, options, preallocationSize);
_strategy = FileStreamHelpers.ChooseStrategy(this, path, mode, access, share, bufferSize, options, preallocationSize, unixCreateMode: null);
}